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Crypt

Crypt() is Unix C library function used for hashing passwords

Hash

A hash function is any well-defined procedure or mathematical function that converts a large amount of data into a small datum, usually a single integer. For questions about the Twitter and Facebook # symbol, use hashtag



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Example

The second hashing function is hash which supports many more algorithms and variants than crypt but does not support some algorithms that crypt does

from question  

Best way to secure user passwords in a mysql database?

Notably backwards compatibility the password functions are essentially a well-written wrapper around crypt and are inherently backwards-compatible with crypt -format hash even if they use obsolete and or insecure hash algorithms

from question  

How to use password_hash

Hash is newer and seems to support more hashing alogrithms than crypt

from question  

Hash() vs. crypt() function comparison

To generate a bcrypt hash it is much safer to use the new password_hash function though there exists also a compatibility pack for earlier php versions

from question  

How can i set blowfish for CRYPT_BLOWFISH function in php

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